Strip/Clamp-On Heaters - PDF Free Download

Max. Operating Typical Max. Temperatures Watt Densities Strip/Clamp-On Heaters Sheath Materials F C W/in 2 W/cm 2 Page Mineral Insulated (MI) 304 stainless steel 1400 760 140 21.7 477 375 High-Temperature Aluminized steel 1100 595 100 15.5 481 FIREBAR Clamp-On Alloy 800 1400 760 120 18.6 304 stainless steel 1200 650 120 18.6 489 Thick Film Conduction 430 stainless steel 1025 550 75 11.6 490 Strip/Clamp-On Heaters WATLOW 475

476 WATLOW

Mineral Insulated (MI) Strip Heaters The MI strip heater is a thin, responsive heater that uses the most advanced heater construction techniques. A nickel-chromium element wire is embedded in Watlow s exclusive mineral insulation material, which has a much higher thermal conductivity than the mica and hard ceramic insulators used in conventional heaters. This thin layer of insulation brings the element wire closer to the heater sheath. The result is heat flows easily from the element wire to the sheath allowing the wire to run cooler than conventional heaters and increasing heater life. Performance Capabilities Sheath temperatures up to 1400 F (760 C) Watt densities up to 140 W/in 2 (21.7 W/cm 2 ) Maximum voltage up to 480VAC UL component recognition for most 240VAC or less designs (UL File #E52951) Features and Benefits Higher watt densities than any other strip heater Provides faster heat up Exclusive mineral insulation Combines dielectric strength and superior thermal conductivity Transfers heat rapidly to the sheath 304 stainless steel sheath Maintains the high compaction of mineral insulation Produces a rigid heater Typical Applications Solder pots Zinc die-casting equipment Die and mold heating High-temperature resins Tank and platen heating Ovens Packaging equipment 0.36 in. (9 mm) Dia. Optional Mounting Holes Mineral Insulation Welded 10-24 Threaded Post Terminals 304 Stainless Steel Sheath Nickel Chromium Element Wire RAPID SHIP Next day shipment WATLOW 477

Mineral Insulated (MI) Strip Heaters Applications and Technical Data Calculating Watt Density Watt density is the amount of wattage per square inch of heated area. To determine watt density, divide the total wattage by the heated area. Watt Density = Wattage Heated Area To apply this equation, the heated area is the total contact surface of the heater less areas of no-heat found around terminals, mounting holes, etc. Heated Area = Total Contact Area - No-Heat Area To calculate the heated area: 1. Using the chart below, locate the no-heat factor corresponding to the type of heater being considered. 2. To use the formula below, insert the no-heat factors, length and width (in inches). Heated Area = (Overall Length - No-Heat Factor) x Width No-Heat Factor Type (in.) 1 in. Wide 1 in. wide post terminal 1 on 1 1.75 1 in. wide post terminal 1 on 1 with mounting holes 3.00 For all other widths 2 on 1 post terminal 1.18 2 on 1 with mounting holes 3.18 The drawings on the next page and the graph on this page will help in selecting the correct watt density for a particular application. First, refer to the drawings to determine the heated area of the heater. Then, use the watt density formula and graph to ensure that the maximum watt density of the heater does not exceed the specific application requirements. Watt Density = Wattage Heated Area Maximum Allowable Watt Density Watt Density - W/cm 2 5 10 15 20 25 30 Part Temperature F 1200 1000 800 600 400 200 MI strip clamped to a good heat sink, operating in 70 F (21 C) ambient air MI strip clamped to a good heat sink, operating in insulated or enclosed environments 600 500 400 300 200 100 Part Temperature C 40 80 120 160 200 Watt Density W/in 2 478 WATLOW

Mineral Insulated (MI) Strip Heaters Applications and Technical Data (Continued) Specifications Width 1, 1 1 /2 and 2 in. (25, 38, 51 mm), tolerance ± 1 /32 Length 8 to 30 in. (203 to 762 mm), tolerance ± 1 /8 Terminations 1 in. (25 mm) wide post terminals one-on-one 1 1 /2 to 2 in. (38 to 51 mm) post terminals two-on-one 1 in. (25 mm) Wide ½ in. 7 8 in. ½ in. TYPE 1 10-24 Screw Thread Heated Length TYPE 2 0.36 in. (9 mm) D, 2 Places 7 8 in. ½ in. ½ in. All Widths 0.715 in. (18.2 mm) 10-24 Screw Thread 5 32 in. (3 mm) 1½ in. 17 8 in. (47.6 mm) Heated Length 1½ in. 17 8 in. (47.6 mm) Note: In most applications, mounting holes alone do not provide adequate clamping. A clamp bar should be used for each 4 in. (102 mm) of heater length. 1 1 /2 in. 2 in. (38 51 mm) Wide TYPE 3 ½ in. 10-24 Screw Thread ¾ in. (19 mm) 7 8 in. ½ in. Heated Length TYPE 4 0.36 (9 mm) D, 2 Places 5 16 in. (7.9 mm) ¾ in. (19 mm) 1½ in. 17 8 in. (47.6 mm) Heated Length 15 16 in. (33.3 mm) ½ in. ½ in. ½ WATLOW 479

Mineral Insulated (MI) Strip Heaters Applications and Technical Data (Continued) Options Thermocouple Pocket Accessories Ceramic Terminal Covers A thermocouple pocket welded to the back surface accepts a 0.063 in. (1.6 mm) diameter thermocouple. This option provides accurate temperature sensing and easy thermocouple replacement. Thermocouple not included. Ceramic terminal covers offer a convenient and economic method to insulate post terminals. They are sized for standard length posts with 10-24 screw thread size, supplied as an accessory item and shipped separately. Specify Z4918 and quantity. Parallel Terminals Part Numbers Type 3 and 4 Approx. Width Length Power Watt Density Net Wt. Part in. (mm) in. (mm) Volts (Watts) W/in 2 (W/cm 2 ) lbs. (kg) Type Number 1 1 /2 (38) 8 (203) 240 500 50 (7.8) 0.3 (0.15) 3 MS1J8AS3 1 1 /2 (38) 12 (305) 120 350 26 (4.0) 0.5 (0.2) 4 MS1J12AV2 1 1 1 /2 (38) 12 (305) 240 350 26 (4.0) 0.5 (0.2) 4 MS1J12AV3 1 1 1 /2 (38) 12 (305) 240 800 49 (7.6) 0.5 (0.2) 3 MS1J12AS2 1 1 /2 (38) 18 (457) 120 1000 40 (6.2) 0.8 (0.3) 3 MS1J18AS1 1 1 /2 (38) 18 (457) 240 1000 40 (6.2) 0.8 (0.3) 3 MS1J18AS2 1 Denotes units with mounting holes. Mounting holes are 0.36 in. (9 mm) in diameter and are intended for use with 1 /4 in. (6 mm) bolts. Centers of mounting holes are located 1 /2 in. from the ends of the heater. RAPID SHIP Next day shipment up to 5 pieces 480 WATLOW

375 High-Temperature Strip Heaters Named for its 0.375 in. (9.5 mm) thickness, the rugged Watlow 375 strip heater is capable of both high temperatures and high watt densities. Watlow begins construction by accurately placing a coiled, nickel-chromium element wire in the center of the heater. The element wire is then embedded in magnesium oxide (MgO)-based insulation compacted into a solid mass creating excellent heat conductivity and high dielectric strength. The heater is then enclosed in aluminized steel or 430 stainless steel sheathing. Performance Capabilities Aluminized steel sheath temperatures up to 1100 F (595 C) 430 stainless steel sheath temperatures up to 1200 F (650 C) Watt densities up to 100 W/in 2 (15.5 W/cm 2 ) UL approved up to 240VAC (File No. E52951) CSA approved up to 600VAC (File No. LR7392) Features and Benefits Nickel-chromium element wire is centered in the heater Assures uniform heat Aluminized steel sheath Operates at higher temperatures and resists corrosion better than iron-sheathed heaters Minimizes heat-up time Optional 430 stainless steel sheath Meets temperature requirements that reach up to 1200 F (650 C) Post terminals, welded to the element wire Produces strong, trouble-free connections Rigid 3 /8 in. (9.5 mm) thick design Enables the heater to fit into many existing applications Over 100 in-stock models in popular sizes and ratings Allows next day shipment Available dimensions are 1 1 /2 in. wide and 5 1 /2 to 48 in. (140 to 1219 mm) long Fits a variety of application needs Mineral Insulation Nickel-Chromium Resistance Wire Typical Applications Food warming Freeze and moisture protection Tank and platen heating Packaging Dies and mold heating Autoclaves Ovens Telecom RAPID SHIP Next day shipment Aluminized Steel Sheath Mounting Slots Welded 10-24 Threaded Post Terminals WATLOW 481

375 High-Temperature Strip Heaters Applications and Technical Data Calculating Watt Density Use the Maximum Allowable Watt Density graphs and formulas to ensure the allowable watt density for the heater does not exceed the specific application requirements. Watt density is calculated for one side of the heater only. Formulas Watt Density = Wattage Heated Area Heated Area (Offset Terminals) = [Overall Length (A) x 1.5 in.] - 6 in 2 = [Overall Length (A) x 38 mm] - 38.7 cm 2 Heated Area (Parallel Terminals) = [Overall Length (A) x 1.5 in.] - 4.7 in 2 = [Overall Length (A) x 38 mm] - 30.3 cm 2 Heated Area (One-on-One Terminals) = [Overall Length (A) x 1.5 in.] - 6 in 2 = [Overall Length (A) x 38 mm] - 38.7 cm 2 Maximum Allowable Watt Density Clamped Watt Density W/cm 2 2 4 6 8 10 12 1200 375 Strip < 24 in. (610 mm) O.A.L.; bar clamped operating in 70 F (21 C) ambient air 600 Part Temperature F 1000 800 600 400 200 Units 24 in. (610 mm) and longer Consult Factory 375 Strip < 24 in. (610 mm) O.A.L.; bar clamped operating in insulated or enclosed environments 500 400 300 200 100 Part Temperature C 20 40 60 80 100 Watt Density W/in 2 Maximum Allowable Watt Density in Air Watt Density W/cm 2 2 4 6 8 10 Sheath Temperature F 1200 1000 800 600 400 200 Sheath Temperature (SS) Sheath Temperature (Aluminized Steel) 70 F (21 C) ambient operating in still air 600 500 400 300 200 100 Sheath Temperature C 20 40 60 80 100 Watt Density W/in 2 482 WATLOW

375 High-Temperature Strip Heaters Termination Options Offset Terminals One-on-One Terminals 1.18 in. (30 mm) 3 8 in. (9.5 mm) 11 2 in. 7 8 in. 10-24 Threaded Terminals A 7 8 in. 1 2 in. 5 16 in. x 1 2 in. (7.94 x 13 mm) Mounting Slots 3 8 in. (9.5 mm) 1.18 in. (30 mm) 3 8 in. (9.5 mm) 11 2 in. 10-24 Threaded Terminals A Heated Length 1 2 in. 7 8 in. 0.950 in. (24.1 mm) 3 8 in. (9.5 mm) 5 16 in. x 1 2 in. (7.9 x 13 mm) Mounting Slots 1 1 2 in. 3 4 in. (19 mm) 1 1 2 in. 23 4 in. (70 mm) Heated Length 11 4 in. (32 mm) Typ. Two 10-24 threaded post terminals are offset from each other on the same end. 1 2 in. Two 10-24 threaded post terminals are placed one on each end. C B Parallel Terminals 1.18 in. (30 mm) 10-24 Threaded Terminals In-Line Terminals 1.18 in. (30 mm) 10-24 Threaded Terminals 3 8 in. (9.5 mm) 11 2 in. 3 4 in. (19 mm) 11 2 in. A 7 8 in. 1 2 in. 5 16 in. x 1 2 in. (7.9 x 13 mm) Mounting Slots 3 8 in. (9.5 mm) 3 8 in. (9.5 mm) 3 4 in. (19 mm) 11 2 in. 11 2 in. 7 8 in. 7 8 in. A 1 2 in. 5 16 in. x 1 2 in. (7.94 x 13 mm) Mounting Slots 3 8 in. (9.5 mm) 17 8 in. (47.6 mm) Heated Length 11 4 in. (32 mm) Typ. Two 10-24 threaded post terminals are used; both terminals on one end. 23 4 in. (70 mm) Heated Length 11 4 in. (32 mm) Typ. Two 10-24 threaded post terminals are in-line with each other on the same end. WATLOW 483

375 High-Temperature Strip Heaters Termination Options (Continued) Accessories Metallic Terminal Boxes - Variations Ceramic Terminal Covers 2 in. (51 mm) 1½ in. 2 in. (51 mm) Available on in-line terminals only. Ceramic terminal covers offer a convenient and economic method to insulate post terminals. They are sized for standard length posts with 10-24 screw thread size, supplied as an accessory item and shipped separately. Specify Z4918 and quantity. 2½ in. (64 mm) 2½ in. (64 mm) Secondary Insulation Bushings 2 in. (51 mm) 1 5 /8 in. (41.3 mm) 3 /8 in. (9.5 mm) 1 /4 in.-20 x 1 1 /2 in. Threaded Length Screw 1 /8 in. (3.2 mm) Available on offset terminals from stock and manufactured. Metallic terminal boxes are available from stock on offset terminals. Terminal boxes act as a safety feature by covering the terminals. A conduit may be attached to the box through 7 /8 in. diameter holes in the ends of the box. To order, specify terminal box. 3 /8 in. (9.5 mm) Insulators are suitable when air heating and/or voltage to ground is a concern. A secondary insulation bushing kit, part number Z5230, contains one set of bushings for one heater. To accommodate bushings, 17 /32 x 11 /16 inch diameter mounting holes must be specified when ordering the heater. 484 WATLOW

Extended Capability Extended Capabilities For 375 High-Temperature Strip Heaters Options Tab Removal Moisture Protection Improved Insulation Resistance Value (IIRV) Treatment This process coats the MgO insulation. The treated insulation fends off moisture when unheated for long periods of time. It is also ideal for heaters that are exported to customers around the world, where high humidity may be a problem. Tab removal is available from stock or manufactured products. Length without tabs equals total length including tabs minus 1 1 /2 in.. Ground Studs and Mounting Studs Standard 1 /4-20 x 1 1 /2 in. or M6-1 x 40 steel studs are welded to the heater. Contact your Watlow representative for exact locations on specific heaters. Flat Tabs Mounting tabs can be formed flat to allow bar clamping. WATLOW 485

375 High-Temperature Strip Heaters Heater Part Numbers Watt Approx. Chromalox Part No. 1 Wellman Part No. 1 Width Length Power Density Net Wt. Part Rust Resist. Chrome Stl. Aluminized Chrome Stl. in. (mm) in. (mm) Term. Volts (Watts) W/in 2 (W/cm 2 ) lbs (kg) Delivery Number Iron Sheath Sheath Steel Sheath Sheath 1 1 /2 (38) 5 1 /2 (140) Parallel 120 125 35 (5.4) 0.4 (0.18) RS SGA1J5JP1 PT-512 5 1 /2 (140) Parallel 120 250 70 (10.8) 0.4 (0.18) RS SGA1J5JP2 PT-502 6 1 2 (152) Parallel 120 150 35 (5.4) 0.4 (0.18) RS SGA1J6AP2 PT-615 6 1 2 (152) Parallel 240 150 35 (5.4) 0.4 (0.18) RS SGA1J6AP3 PT-615 6 1 2 (152) Parallel 120 300 70 (10.8) 0.4 (0.18) RS SGA1J6AP4 PT-603 6 1 2 (152) Parallel 240 300 70 (10.8) 0.4 (0.18) RS SGA1J6AP5 PT-603 7 1 /2 (191) Offset 120 150 29 (4.5) 0.5 (0.23) RS SGA1J7JO1 OT-715 SS1041 7 1 /2 (191) Offset 240 150 29 (4.5) 0.5 (0.23) M SGA1J7JO2 OT-715 SS1052 7 1 /2 (191) Offset 240 200 38 (5.9) 0.5 (0.23) RS SGA1J7JO3 OT-702 SS2052 8 1 2 (203) Offset 120 150 25 (3.9) 0.5 (0.23) RS SGA1J8AO1 OT-815 SS1061 8 1 2 (203) Offset 240 150 25 (3.9) 0.5 (0.23) RS SGA1J8AO5 OT-815 SS1072 8 1 2 (203) Offset 120 175 29 (4.5) 0.5 (0.23) RS SGA1J8AO6 OT-817 SS1081 8 1 2 (203) Offset 240 175 29 (4.5) 0.5 (0.23) M SGA1J8AO7 OT-817 SS1092 8 1 2 (203) Offset 120 250 42 (6.5) 0.5 (0.23) RS SGA1J8AO2 OT-802 SS2061 8 1 2 (203) Offset 240 250 42 (6.5) 0.5 (0.23) RS SGA1J8AO8 OT-802 SS2072 8 1 2 (203) Offset 120 400 67 (10.4) 0.5 (0.23) RS SGA1J8AO9 OT-804 SS2081 8 1 2 (203) Offset 240 400 67 (10.4) 0.5 (0.23) RS SGA1J8AO10 OT-804 SS2092 8 1 2 (203) Offset 120 500 83 (12.9) 0.5 (0.23) RS SGA1J8AO3 8 1 2 (203) Offset 240 500 83 (12.9) 0.5 (0.23) RS SGA1J8AO4 8 1 2 (203) 1-on-1 120 150 24 (3.7) 0.5 (0.23) RS SGA1J8AT1 S-815 SD1021 8 1 2 (203) 1-on-1 240 150 24 (3.7) 0.5 (0.23) M SGA1J8AT2 S-815 SD1032 9 1 /2 1 2 (241) 1-on-1 120 200 23 (3.6) 0.6 (0.27) M SGA1J9JT1 S-920 SD1041 10 1 /2 (267) Offset 120 250 26 (4.0) 0.7 (0.32) RS SGA1J10JO1 OT-1025 SS1101 10 1 /2 (267) Offset 240 250 26 (4.0) 0.7 (0.32) RS SGA1J10JO2 OT-1025 SS1102 10 1 /2 (267) Offset 120 350 36 (5.6) 0.7 (0.32) RS SGA1J10JO8 OT-1003 SS2101 10 1 /2 (267) Offset 240 350 36 (5.6) 0.7 (0.32) RS SGA1J10JO5 OT-1003 SS2112 10 1 /2 (267) Offset 120 400 41 (6.4) 0.7 (0.32) RS SGA1J10JO6 OT-1004 SS2131 10 1 /2 (267) Offset 240 400 41 (6.4) 0.7 (0.32) RS SGA1J10JO7 OT-1004 SS2132 12 1 2 (305) Offset 120 250 21 (3.3) 0.8 (0.32) RS SGA1J12AO1 OT-1225 OT-1202 SS1141 12 1 2 (305) Offset 240 250 21 (3.3) 0.8 (0.32) RS SGA1J12AO2 OT-1225 OT-1202 SS1152 12 1 2 (305) Offset 120 350 29 (4.5) 0.8 (0.36) RS SGA1J12AO5 OT-1203 SS2141 12 1 2 (305) Offset 240 350 29 (4.5) 0.8 (0.36) RS SGA1J12AO6 OT-1203 SS2152 12 1 2 (305) Offset 120 500 42 (6.5) 0.8 (0.36) RS SGA1J12AO3 OT-1205 SS2161 12 1 2 (305) Offset 240 500 42 (6.5) 0.8 (0.36) RS SGA1J12AO4 OT-1205 SS2172 12 1 2 (305) 1-on-1 120 250 20 (3.1) 0.8 (0.36) M SGA1J12AT1 S-1225 S-1202 SD1061 SD2071 12 1 2 (305) 1-on-1 240 250 20 (3.1) 0.8 (0.36) RS SGA1J12AT2 S-1225 S-1202 SD1072 SD2082 12 1 2 (305) 1-on-1 240 500 40 (6.2) 0.8 (0.36) RS SGA1J12AT3 S-1205 SD2122 14 1 2 (356) Offset 120 300 20 (3.1) 0.9 (0.41) RS SGA1J14AO2 OT-1430 SS1181 14 1 2 (356) Offset 240 300 20 (3.1) 0.9 (0.41) RS SGA1J14AO1 OT-1430 SS1192 14 1 2 (356) Offset 120 500 33 (5.1) 0.9 (0.41) RS SGA1J14AO3 OT-1405 SS2181 14 1 2 (356) Offset 240 500 33 (5.1) 0.9 (0.41) RS SGA1J14AO4 OT-1405 SS2192 14 1 2 (356) 1-on-1 120 300 20 (3.1) 0.9 (0.41) M SGA1J14AT1 S-1430 SD1131 15 1 /4 (387) Offset 120 325 19 (2.9) 1.0 (0.45) M SGA1J15EO2 OT-1532 SS1201 15 1 /4 (387) Offset 240 325 19 (2.9) 1.0 (0.45) M SGA1J15EO3 OT-1532 SS1212 15 1 /4 (387) Offset 240 500 30 (4.6) 1.0 (0.45) RS SGA1J15EO4 OT-1505 SS2212 1Chromalox and Wellman part numbers are used as a cross reference to help select the equivalent Watlow part number. Chromalox sizes 27 in. (686 mm) and longer, and all Wellman sizes have mounting slot center to center distances 1 /8 in. (3.2 mm) less than Watlow spacing. RAPID SHIP RS - Next day shipment CONTINUED M - Manufacturing lead times 486 WATLOW

375 High-Temperature Strip Heaters Heater Part Numbers (Continued) Watt Approx. Chromalox Part No. 1 Wellman Part No. 1 Width Length Power Density Net Wt. Part Rust Resist. Chrome Stl. Aluminized Chrome Stl. in. (mm) in. (mm) Term. Volts (Watts) W/in 2 (W/cm 2 ) lbs (kg) Delivery Number Iron Sheath Sheath Steel Sheath Sheath 1 1 /2 (38) 17 7 /8 (454) Offset 120 350 17 (2.6) 1.2 (0.54) RS SGA1J17RO4 OT-1835 SS1221 SS2221 17 7 /8 (454) Offset 240 350 17 (2.6) 1.2 (0.54) M SGA1J17RO5 OT-1835 SS1232 SS2232 17 7 /8 (454) Offset 120 375 18 (2.8) 1.2 (0.54) RS SGA1J17RO6 OT-1837 SS1261 SS2241 17 7 /8 (454) Offset 240 375 18 (2.8) 1.2 (0.54) M SGA1J17RO7 OT-1837 SS1252 17 7 /8 (454) Offset 120 500 24 (3.7) 1.2 (0.54) RS SGA1J17RO1 OT-1850 SS1261 SS2241 17 7 /8 (454) Offset 240 500 24 (3.7) 1.2 (0.54) RS SGA1J17RO2 OT-1850 SS1272 SS2252 17 7 /8 (454) Offset 120 750 36 (5.6) 1.2 (0.54) RS SGA1J17RO9 OT-1807 SS2261 17 7 /8 (454) Offset 240 750 36 (5.6) 1.2 (0.54) RS SGA1J17RO8 OT-1807 SS2272 17 7 /8 (454) Offset 120 1000 48 (7.4) 1.2 (0.54) RS SGA1J17RO10 OT-1801 SS2281 17 7 /8 (454) Offset 240 1000 48 (7.4) 1.2 (0.54) RS SGA1J17RO3 OT-1801 SS2292 17 7 /8 (454) 1-on-1 120 500 24 (3.7) 1.2 (0.54) M SGA1J17RT1 S-1850 S-1805 SD1211 SD2171 17 7 /8 (454) 1-on-1 240 500 24 (3.7) 1.2 (0.54) RS SGA1J17RT2 S-1850 S-1805 SD1222 SD2182 17 7 /8 (454) 1-on-1 240 750 35 (5.4) 1.2 (0.54) M SGA1J17RT3 S-1807 SD2202 17 7 /8 (454) 1-on-1 120 1000 47 (7.3) 1.2 (0.54) M SGA1J17RT4 S-1801 SD2211 17 7 /8 (454) 1-on-1 240 1000 47 (7.3) 1.2 (0.54) M SGA1J17RT5 S-1801 SD2222 19 1 /2 (496) Offset 240 350 15 (2.3) 1.3 (0.59) M SGA1J19JO6 OT-1935 SS1301 19 1 /2 (496) Offset 120 500 22 (3.4) 1.3 (0.59) M SGA1J19JO7 OT-1950 OT-1905 SS2301 19 1 /2 (496) Offset 240 500 22 (3.4) 1.3 (0.59) RS SGA1J19JO4 OT-1950 OT-1905 SS2312 19 1 /2 (496) Offset 240 750 32 (5.0) 1.3 (0.59) RS SGA1J19JO8 OT-1907 19 1 /2 (496) Offset 240 1000 43 (6.7) 1.3 (0.59) RS SGA1J19JO1 OT-1901 SS2332 19 1 /2 (496) 1-on-1 240 750 32 (5.0) 1.3 (0.59) M SGA1J19JT1 S-1907 SD2262 21 1 2 (533) Offset 120 500 20 (3.1) 1.4 (0.64) M SGA1J21AO1 OT-2150 SS1341 21 1 2 (533) Offset 240 500 20 (3.1) 1.4 (0.64) RS SGA1J21AO2 OT-2150 SS1352 21 1 2 (533) Offset 120 750 29 (4.5) 1.4 (0.64) M SGA1J21AO3 OT-2107 SS2341 21 1 2 (533) Offset 240 750 29 (4.5) 1.4 (0.64) RS SGA1J21AO4 OT-2107 SS2352 21 1 2 (533) 1-on-1 120 500 19 (2.9) 1.4 (0.64) M SGA1J21AT1 S-2050 S-2005 SD1291 SD2291 23 3 /4 (603) Offset 120 500 17 (2.6) 1.5 (0.68) RS SGA1J23NO5 OT-2450 OT-2405 SS1361 SS2361 23 3 /4 (603) Offset 240 500 17 (2.6) 1.5 (0.68) RS SGA1J23NO6 OT-2450 OT-2405 SS1372 SS2372 23 3 /4 (603) Offset 120 750 25 (3.9) 1.5 (0.68) M SGA1J23NO1 OT-2475 OT-2407 SS1391 SS2381 23 3 /4 (603) Offset 240 750 25 (3.9) 1.5 (0.68) RS SGA1J23NO2 OT-2475 OT-2407 SS1402 SS2392 23 3 /4 (603) Offset 120 1000 34 (5.3) 1.5 (0.68) RS SGA1J23NO7 OT-2401 SS2401 23 3 /4 (603) Offset 240 1000 34 (5.3) 1.5 (0.68) RS SGA1J23NO3 OT-2401 SS2412 23 3 /4 (603) Offset 240 1500 51 (7.9) 1.5 (0.68) RS SGA1J23NO4 OT-2415 23 3 /4 (603) 1-on-1 240 250 8 (1.2) 1.5 (0.68) M SGA1J23NT1 S-2425 SD1322 23 3 /4 (603) 1-on-1 240 500 17 (2.6) 1.5 (0.68) M SGA1J23NT3 S-2450 S-2404 SD1342 SD2322 23 3 /4 (603) 1-on-1 240 750 25 (3.9) 1.5 (0.68) RS SGA1J23NT5 S-2407 SD2352 23 3 /4 (603) 1-on-1 120 1000 33 (5.1) 1.5 (0.68) M SGA1J23NT6 S-2401 SD2361 23 3 /4 (603) 1-on-1 240 1000 33 (5.1) 1.5 (0.68) M SGA1J23NT7 S-2401 SD2372 23 3 /4 (603) 1-on-1 240 1500 50 (7.8) 1.5 (0.68) M SGA1J23NT8 S-2415 25 1 /2 (648) Offset 120 500 16 (2.5) 1.7 (0.77) RS SGA1J25JO1 OT-2550 SS1421 25 1 /2 (648) Offset 240 500 16 (2.5) 1.7 (0.77) RS SGA1J25JO2 OT-2550 SS1432 25 1 /2 (648) Offset 120 750 23 (3.6) 1.7 (0.77) M SGA1J25JO3 OT-2575 OT2507 SS1441 SS2421 25 1 /2 (648) Offset 240 750 23 (3.6) 1.7 (0.77) RS SGA1J25JO4 OT-2575 OT-2507 SS1452 SS2432 25 1 /2 (648) Offset 240 1000 31 (4.8) 1.7 (0.77) RS SGA1J25JO5 OT-2501 SS2452 1Chromalox and Wellman part numbers are used as a cross reference to help select the equivalent Watlow part number. Chromalox sizes 27 in. (686 mm) and longer, and all Wellman sizes have mounting slot center to center distances 1 /8 in. (3.2 mm) less than Watlow spacing. RAPID SHIP RS - Next day shipment CONTINUED M - Manufacturing lead times WATLOW 487

FIREBAR Clamp-On Heaters FIREBAR CUTAWAY FIREBAR heating elements provide added heating performance over standard round tubular heating elements especially for immersion applications in petroleum based liquids requiring high kilowatts. The FIREBAR s unique flat surface geometry packs more power in shorter elements and assemblies, along with a host of other performance improvements. These include: Minimizing coking and fluid degrading Enhancing the flow of fluid past the element s surface to carry heat from the sheath Improving heat transfer with a significantly larger boundary layer allowing much more liquid to flow up and across the sheath s surface FIREBAR elements are available in single- and double-ended constructions with one inch or 5 /8 inch heights. These two configuration variables make it possible to use FIREBAR elements instead of round tubular elements in virtually all applications. 5/8 FIREBAR CUTAWAY Nickel-Chromium Resistance Wire MgO Insulation Wire to Pin 360 Fusion Weld Metal Sheath Flexible Lead Wires One-Inch Double-Ended FIREBAR Element and Lead Configurations Nickel-Chromium Resistance Wire MgO Insulation Metal Sheath Wire to Pin 360 Fusion Weld Flexible Lead Wires 5 8-Inch Double-Ended FIREBAR Element and Lead Configurations For detailed product and technical data, see the full FIREBAR product section located on pages 93 through 111. WATLOW 489

Thick Film Conduction Heaters The Watlow 430 stainless steel thick film conduction heater is ideal for many applications where fast response and uniformity are essential. A clamp-on, thick film heater provides the best possible combination of heat transfer, thermal efficiency, temperature response and uniformity in a low profile package. This high-performance heater can be used in areas where space is limited or where conventional heaters cannot be used due to limited voltage and wattage combinations. Thick film conduction heaters provide a low profile in a variety of shapes including two-dimensional circular and rectangular forms. Direct contact of thick film heaters to surfaces ensures efficient heat transfer through thermally stable substrates and precise resistance trace patterns. Performance Capabilities Maximum substrate temperature up to 1022 F (550 C). Contact your Watlow representative for applications over 842 F (450 C) Watt densities up to 75 W/in 2 (11.6 W/cm 2 ) Voltages up to 240V Features and Benefits Watt densities up to 75 W/in 2 (11.6 W/cm 2 ) for clamp-on applications Allows precise, repeatable wattage distribution and uniform temperature profile Threaded stud termination Produces strong, trouble-free connections, see Termination Assembly drawing on page 464 Agency approvals UL component recognition available upon request Dielectric Glass Layers Resistor Circuit Trace Typical Applications Food warming cabinets Load dump resistors Seal bars Deposition chamber lids 430 SS Substrate For detailed product and technical data, see the full Thick Film Conduction product section located on pages 463 through 46. 490 WATLOW